Incandescent lamp with concentrated metallic filaments.



H. j. JAEGER.

INCANDESCENT LAMP WITH CONCENTRATED METALLIC FILAMENTS.

APPLICATION FILED APR-10,1915.

Patented Sept. 5, 1916.

HERMAN J. JAEGER, 0F `WEEHAWKEN, NEW JERSEY, ASSIGNOR T0 H. J'. JAEGERCOMPANY, 0F HOBOKEN, NEW J ERSEY, A CORPORATION OF NEW JERSEY.

INCANDESCENT LAMP WITH CONCENTRTED METALLIC FILAMENTS.

Specification of Letters Patent.

Patented Sept. 5, T9116.

Application led AprillO, 1915. Serial No. 20,415.

Tol all ankam it may concern Be it known that LHERMAN J. JAEGER, acitizen of the United States of America, and a resident of Weehawken,county of Hudson, State of New Jersey, have invented certain new 'anduseful Improvements in Tncandescent Lamps with Concentrated Metallic.

Filaments, of which the following is a specification.

This invention has reference to improvements in metallic filament lamps.

Tt pertains particularly to lamps provided with so called concentratedmetallic filaments as the incandescing body and has for its specialobject to produce a lamp of this kind which is provided with twoindependent sections of a filament of which each section may be burnedseparately or both sections may be burned simultaneously. Thus, thepresent lamp actually contains two lamps in one and constitutes a lampof say, standard candle power or twice the candle power of such standardlamp. s

Assuming that eachsection or, half of the filament burns at 110 voltsand consumes a certain number of watts of some standard lamp, then suchsection or half of the filament represents in itself a standard lamp.

When burned out, the second section or half,y

of the filament of like voltage and wattage may be burned independently,whereby th'e life of the lamp is double or, if4 desired, both sectionsmay be burned simultaneously for the purpose of obtaining double candlepower. 4

These desirable objects have been primarily attained by the use of'three leads with such accessory parts/as are required for rendering itpossible to bring one section or half of the filament into the circuit,or the other half or both simultaneously.

Tn order to render the invention entirely clear, reference is had tothev accompanying drawing, in which:

I Figure 1 represents 1n elevation, an incandescent electric lamp withconcentrated metallic filaments embodying'indesirable -l form, thepresent improvements.A Fig. 2- is a'bottom plan view relativev toFig. 1. Fig.

3 illustrates the upper portion of a suspended lamp partly in .sectionshowing the leads connected so as to have both filament sections in thecircuit. I Fig. 4c' isA av similar platinum wires in the usual manner.

supports'for the incandescingfilament. A.4 wire d' 1s fusedcentrally'into the support.

or stem and isolated therefrom. The wire d 'carries a glass rim c fusedto its inner end. The glass rim carries a plurality of filament.supports which are fused therein. Six of these supports are shown inFig. l. Two of these supports f, g are rather heavy and carry each afine wire support f1, g1 which extends as far as the leads. At the endsof these supports, small loops are formed. The four other filamentsupports h, z', j, 7c are relatively short, they consist of wires onlyand also form each a loop at the end.

As herein mentioned there are three leads, one heavy lead l passesthrough the stem on one side, while the two leads m, n, are closetogether and passthrough thestem at the opposite side. There are twoindependant filaments 0, p in this lamp, but two of their ends areattached to the principal lead Z, while the opposite end of one filamentsecl tion or filament half is attached to the lead m and the second endof the second filament half or section to the vvlead a. Thus, bothfilaments form a single uninterrupted filament which however, is open.there being a space between the leads m, n which is free from anyfilament portion. centrate the light, the filament is bent up and downpassing alternately and successively through the short and longsupports.

To render it possible to light each filament section or halfindependently or. both together simultaneously means are provided withinthe socket for attaining this purpose.

The principal lead Z isalways connected to the base g at the point g1 inthe usual manner. The two other leads m., a which are close together andopposite the principal ln order to con# .or halves ofthe filament.

lead are connected Within the base so that one alone, m ina)v beconnected in the circuit for illuminating one section or half' of thefilament or both wires may be connected simultaneously for illuminatingboth sections This may be accomplished in various ways. In Figs. 3 andLl, one example of construction is shown in which the lead m is inelectric connection with a sleeve i. This sleeve is threaded on theinside and acts as a nut for the screw s which thus, is electricallyconnected with the lead position indicated in Fig. l, then an air gapexists between the screw and the other parts within the base Q. rThisair gap or air space acts as an insulator and 'when the lamp. is appliedto a socket, then electric connection is made with the principal leadand with the screw and thereby with the lead m. Accordingly the filamentsection 0 algne is rendered incandescent. It' it is desired to lightbot-h filament sections o and p then. the lamp is removed from thesocket and the screw sscrewed down upon the adjoiningr parts within thebase. The metal washer s1 on the screw a now contacts With the metalwasher u to which the lead n is connected both being insulated by arubber washer i. Now the'lamp is applied to the socket and as all thethree leads are in the circuit both filament sections are lightedsimultaneously. Should one filament section or half burn out, -the otherone will burn independently. It the filament half 0 burns out the screws is screwed down so as to place the filament section p into thecircuit, and if the filament section p is burnt out, then the screw smakes connection no matter whether it is in the position shown in Fig. 4or Fig.4 3.

Assuming' that the screw s is in the` I claim as my invention: 1. Anincandescent lamp with concentrated metallic filaments comprising aglobe with a stem, three leads passing through- Said stem, a filamentsupport fused centrally therein, a glass rim at its free end, two longsupports and iour short supports fused into said rim, and twoindependent filaments connected with one end each to one lead and withthe other end each to one of the two other leads and passing alternatelythrough the short and long,` supports, and means in connection with theleads to render one filanient incandescent or hotli simultaneously.

3. An incandescent electric lamp coinprising a stem, a filament supportfused centrally therein, a `:glass rim at its free end, a few long;supports, and a double number of short supports fused into the said rim,two independent concentrated metallic filaments passing alternately fromthe short to the long supports, and means in connection with thefilament-s to render one incandescent or both simultaneously.

3. An incandescent electric lamp coniprising a stein, a filament supportfused centrally therein, a glass rim at its free end, two long supportson said rim, four short wire supports fused into said rim, twoindependent; concentrated metallic filaments passing alternately fromthe short to the long supports, and means in connection with the saidfilaments to render one filament incan descent or both simultaneously.

Signed at New York, N. Y., this 9th day of April, 1915.

HERMAN J. JAEGER.

Witnesses:

IDA E. ROLAND, ELEANORE Hor PMANN.

